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#--
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# CyborgHood, a distributed system management software.
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# Copyright (c) 2009-2010 Marc Dequènes (Duck) <Duck@DuckCorp.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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require 'yaml'
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require 'cyborghood/cyborg/session'
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require 'cyborghood/cyborg/protocol'
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module CyborgHood
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class ConversationThread
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attr_reader :conversation, :name, :id, :session
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def initialize(conversation, id, name)
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@conversation = conversation
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@name = name
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@id = id
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@session = Session.new
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@next_action_id = 0
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end
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def new_message(action_code, parameters = nil, action_id = nil)
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Message.new(self, action_code, parameters, action_id)
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end
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def next_action_id
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id = @next_action_id
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@next_action_id +=1
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id
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end
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def close
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@session.clear
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end
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end
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class Message
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attr_reader :conv_thread, :action_code, :action_parameters, :action_id, :reply_to_action_id
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def initialize(conv_thread, action_code, action_parameters = nil, action_id = nil)
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@conv_thread = conv_thread
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@action_code = action_code
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@action_parameters = action_parameters
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@reply_to_action_id = action_id
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@action_id = nil
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end
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def new?
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@reply_to_action_id.nil?
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end
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def sent?
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@action_id.nil?
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end
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def send
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raise CyberError.new(:unrecoverable, "bot/conversation", "Not sending twice the same message") unless self.sent?
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@action_id = @conv_thread.next_action_id
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@conv_thread.conversation.send_message(self)
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end
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def create_reply(action_code, parameters = nil)
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raise CyberError.new(:unrecoverable, "bot/conversation", "Cannot reply to a newly created message") if self.new?
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self.class.new(@conv_thread, action_code, parameters, @action_id)
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end
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end
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class Conversation < EventMachine::Protocols::LineAndTextProtocol
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# don't rely on EventMachine's default, it may change one day
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MaxLineLength = 16*1024
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EOD = "\033[0J"
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BOT_NAME_PATTERN = "[A-Z][a-zA-Z0-9]+"
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ACTION_WORD_PATTERN = "[a-zA-Z0-9]+"
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ACTION_PATTERN = "^(#{BOT_NAME_PATTERN})-([0-9]{4})-([0-9]{4})([+]?) (#{ACTION_WORD_PATTERN}( #{ACTION_WORD_PATTERN})*)$"
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MAXIMUM_ERROR_COUNT = 3
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MAXIMUM_LINES = 1024
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attr_reader :bot, :peer_name, :peer_capabilities
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def initialize(bot, block = nil)
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@bot = bot
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@comm_logic_block = block
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super
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@config = Config.instance
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@error_count = 0
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@split_data_mode = false
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@split_data_message = nil
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@split_data = []
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# associated conversation threads
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@conv_threads = {}
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@conv_threads_index = {}
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# thread 0 is reserved
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@next_thread_id = 0
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@system_thread = self.thread('system')
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# post-negociation peer info
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@peer_name = nil
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@peer_capabilities = []
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@comm_stop = false
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@protocol = BotProtocol.new(self)
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end
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def post_init
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logger.info "New conversation with #{identifier}"
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@protocol.send_announce_helo unless @comm_logic_block.nil?
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rescue
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logger.error "Conversation post_init: " + $!
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connection_close
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end
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def receive_line(data)
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return if @comm_stop or data.empty?
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clear_receive_info
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if data == EOD
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logger.debug "Received EOD [#{identifier}]"
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exit_split_mode
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else
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if @split_data_mode
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logger.debug "Received data (split mode) [#{identifier}]: #{data}"
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if @split_data.size > MAXIMUM_LINES
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reply_fatal_error "overflow"
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else
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@split_data << data
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end
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else
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logger.debug "Received data [#{identifier}]: #{data}"
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if data =~ Regexp.new(ACTION_PATTERN)
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# TODO: pass peer_name into Message and use it in Protocol to check replies match
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peer_name = $1
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conv_thread_id = $2.to_i
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action_id = $3.to_i
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flags = $4 || ""
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action_code = $5
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conv_thread = self.thread_by_id(conv_thread_id)
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message = conv_thread.new_message(action_code, nil, action_id)
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if flags.index '+'
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enter_split_mode(message)
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else
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receive_message(message)
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end
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else
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reply_syntax_error "bad action format"
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end
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end
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end
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check_errors
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end
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def receive_message(message)
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logger.debug "Received message '#{message.action_code}' [#{identifier}]"
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@protocol.process_received_message(message)
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end
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def receive_error(msg)
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logger.error "Error [#{identifier}]: #{msg}"
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@error_count += 1
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end
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def unbind
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logger.info "Conversation finished with #{identifier} (#{@peer_name})"
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@bot.unregister_communication @peer_name unless @peer_name.nil?
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@conv_threads.each_value {|s| s.close }
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@comm_logic_block.call false unless @comm_logic_block.nil? or @protocol.negociation_ok?
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end
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def bye
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@protocol.send_quit_leaving
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end
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def set_peer_info(name, capabilities)
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@peer_name = name
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@peer_capabilities = capabilities || []
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logger.info "Peer name for #{identifier}: #{@peer_name}"
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logger.info "Peer capabilities for #{identifier}: #{@peer_capabilities.join(", ")}"
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@bot.register_communication @peer_name, self
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end
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def set_comm_ready
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logger.info "Protocol negociation with '#{@peer_name}' on #{identifier} succeeded"
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@comm_logic_block.call self unless @comm_logic_block.nil?
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end
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def set_comm_stop
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@comm_stop = true
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yield if block_given?
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close_connection_after_writing
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end
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def set_error_status(fatal = false)
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# fatal status is conservative, it cannot be canceled
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@reveive_fatal_error = @reveive_fatal_error || fatal
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@receive_error = true
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end
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def thread(name = 'default')
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@conv_threads[name] || new_thread(name)
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end
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def thread_by_id(id)
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name = @conv_threads_index[id]
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name.nil? ? new_thread("noname/#{id}", id) : @conv_threads[name]
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end
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def send_message(message)
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raise CyberError.new(:unrecoverable, "bot/conversation", "Cannot send message without action id") if message.action_id.nil?
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flags = ""
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flags += "+" unless message.action_parameters.nil?
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send_line sprintf("%s-%04d-%04d%s %s", @bot.name, message.conv_thread.id, message.action_id, flags, message.action_code)
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unless message.action_parameters.nil?
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message.action_parameters.to_yaml.each_line {|l| send_line l }
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send_line EOD
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end
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end
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protected
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def clear_receive_info
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@receive_error = false
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@receive_fatal_error = false
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end
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def send_line(msg)
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return if error?
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logger.debug "Sending data [#{identifier}]: #{msg}"
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send_data "#{msg}\n"
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end
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def check_errors
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@error_count += 1 if @receive_error
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msg_quit = nil
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if @error_count >= MAXIMUM_ERROR_COUNT
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msg_quit = "too much errors, terminating"
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elsif @fatal_error
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msg_quit = "previous fatal error"
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end
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@protocol.send_quit_decline msg_quit unless msg_quit.nil?
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end
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def new_thread(name, id = nil)
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id ||= @next_thread_id
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th = ConversationThread.new(self, id, name)
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@next_thread_id = [@next_thread_id, id + 1].max
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@conv_threads[th.name] = th
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# allow searching by id too
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@conv_threads_index[th.id] = name
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th
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end
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def reply_syntax_error(msg = nil)
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logger.error "Protocol error [#{identifier}]: syntax error (#{msg})"
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msg = "syntax error" + (msg ? ": " + msg : "")
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@protocol.send_error_protocol(msg)
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end
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def reply_fatal_error(msg = nil)
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logger.error "Protocol error [#{identifier}]: fatal error (#{msg})"
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msg = "fatal error" + (msg ? ": " + msg : "")
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@protocol.send_error_protocol(msg, true)
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end
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def enter_split_mode(message)
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if @split_data_mode
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reply_fatal_error "already in split mode"
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@split_data_mode = false
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@split_data_message = nil
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else
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logger.debug "Protocol info [#{identifier}]: entered split mode for action '#{message.action_id}'"
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@split_data_mode = true
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@split_data_message = message
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end
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@split_data = []
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end
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def exit_split_mode
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if @split_data_mode
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logger.debug "Protocol info [#{identifier}]: quit split mode for action '#{@split_data_message.action_id}'"
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parameters = YAML.load(@split_data.join("\n"))
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reply_syntax_error("bad parameters format") if parameters.nil?
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message = @split_data_message.conv_thread.new_message(@split_data_message.action_code, parameters, @split_data_message.reply_to_action_id)
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receive_message(message)
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else
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reply_fatal_error "not in split mode"
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end
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@split_data_mode = false
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@split_data_message = nil
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@split_data = []
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end
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def identifier
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"#{@bot.identifier_prefix}/#{@signature}"
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end
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end
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end
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